Microwave hydrothermal synthesis and upconversion luminescence properties of $$\hbox {Yb}^{3+}$$ Yb 3 + / $$\hbox {Tm}^{3+}$$

Abstract

Tetragonal NaY(MoO 4) 2 (NYM) phosphors co-doped with Yb 3+ and Tm 3+ ions were synthesized through microwave hydrothermal method followed by calcining treatment. Powder X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy and photoluminescence spectra were used to characterize the properties of asprepared samples. The results show that Yb 3+ /Tm 3+ co-doped NYM displayed bright blue emission near 472 and 476 nm (1 G 4 → 3 H 6 transition), strong near-infrared upconversion (UC) emission around 795 nm (3 H 4 → 3 H 6 transition). The optimum doping concentrations of Yb 3+ and Tm 3+ for the most intense UC luminescence were obtained, and the related UC mechanism of Yb 3+ /Tm 3+ co-doped NYM depending on pump power was studied in detail.

Microwave hydrothermal synthesis and upconversion properties of Yb3+/Er3+ doped YVO4 nanoparticles

“…It is worth noting that with the increasing concentration of Yb 3+ , the diffraction peaks gradually shift towards the higher 2θ value as shown in figure 1(b) for the most intense (200) peak in the XRD spectra. Since the ionic radius of Yb 3+ ion (0.0868 nm) is less than that of the Y 3+ ion (0.0900 nm), the shifting of the peak is due to the shrinkage of the lattice parameters as a result of the substitution of Yb 3+ in the Y 3+ sites [23].…”

“…The use of microwave heating leads to a shorter reaction time, improved physical and chemical properties of the products and increased yields through a different nucleation and growth pathway compared to conventional heating [22]. There are several reports on the microwave hydrothermal synthesis and upconversion luminescence properties of Ln 3+ doped materials [21,23,24]. However, microwave assisted hydrothermal synthesis of Yb 3+ /Er 3+ :YVO 4 nanophosphor and its upconversion properties have been scarcely investigated.…”

Síntese por pirólise de aerossol e caracterização de molibdato de sódio e ítrio (NaY(MoO>sub<4>/sub<)>sub<2>/sub<) dopados com íons lantanídeos e estudos de conversão de energia

“…Dentre as matrizes do tipo MLn(MoO4)2, a matriz molibdato de sódio e ítrio (NaY(MoO4)2) tem sido amplamente estuda por diversos pesquisadores [24][25][26]. Já foram reportadas na literatura a síntese de NaY(MoO4)2 pelas metodologias hidrotermal [24][25][26] e reação do estado sólido [27] dopados com diversos íons lantanídeos.…”

“…Dentre as matrizes do tipo MLn(MoO4)2, a matriz molibdato de sódio e ítrio (NaY(MoO4)2) tem sido amplamente estuda por diversos pesquisadores [24][25][26]. Já foram reportadas na literatura a síntese de NaY(MoO4)2 pelas metodologias hidrotermal [24][25][26] e reação do estado sólido [27] dopados com diversos íons lantanídeos. Trabalhos recentes mostraram que esta matriz apresenta potencial para aplicação em termometria a partir da conversão ascendente de energia, como reportado por Xingxing et al, 2015 [28] com a matriz co-dopada com Yb 3+ /Er 3+ sintetizada pelo método hidrotermal [28].…”